John P. Flaherty, MD
Northwestern Medical GroupPrimary Specialty
Infectious Disease
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Accepts your insurance
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Based on January 2026 plan details.
Accepted plans are subject to change. To be sure this medical professional is covered by your insurance plan, please contact your insurance carrier.
Practice Focus Areas
This medical professional has a particular interest or expertise in:
- Fever of Unknown Origin
- Fungal Infections
- Human Immunodeficiency Virus (HIV/AIDS)
- Parasitic Disease
- Prosthetic Device Infections
- Travel-related Infections
- Tuberculosis
Education
- Medical Education:
-
MD, University of Illinois at Chicago College of Medicine - 1983
- Residency:
-
University of Iowa Hospitals and Clinics - 1986
- Fellowships:
-
University of Chicago - 1987
Board Certifications
- American Board of Internal Medicine - Infectious Disease (Certified)
- American Board of Internal Medicine - Internal Medicine (Certified)
Faculty Profile
Professor, Feinberg School of MedicinePractice Groups and Affiliations
- Medical Group:
- Northwestern Medical Group
- Alignment Category:
-
Northwestern Medicine Physician Network
- On Medical Staff At:
-
Northwestern Memorial Hospital
Ratings and Reviews
At Northwestern Medicine, our patient’s feedback is important to us. While different care providers have their own unique strengths, we strive to be as transparent as possible with our quality of care.
Read Ratings FAQsOverall Rating
224 Ratings
Reviews from Patients
Reviews from Patients
October 28, 2025
5.0 star star star star starHe's is so great. Beside manner comforting.. I was very sick 20 yrs ago or so when I met Dr. Flaherty. He, in my opinion saved my life. I am 65 today, strong, healthy and recapturing my life and most of all, my future.. I am so grateful for Northwestern Hospital...
October 01, 2025
5.0 star star star star starHe's patient, listens, very knowledgeable, professional, and thorough. He spent time with me, listening to my problems and concerns, a trait that most doctors don't have: they make one feel rushed.
July 20, 2025
5.0 star star star star starWe have been 'working' with each other for 20 years at this point in time. He has been/is extremely helpful in providing current information on the infection along with current views on moving forward with dealing with the infection. He is knowledgeable as well as easy to talk with/consult with
Disclosures
Industry Relationships
Consulting
Faculty member and/or their immediate family have engaged in activities such as speaking, advising, consulting, or providing educational programs for the following companies or other entities
- CVS Caremark
Faculty member received compensation for medical record consultation and/or expert witness testimony.
External Professional Relationships
Pharmaceutical, device, and biotechnology companies frequently collaborate with basic scientists and physicians within an academic medical center to help advance science and improve patient care. These relationships are important in achieving scientific breakthroughs and in establishing the effectiveness and safety of promising new therapies. In order to assure objectivity in clinical research and patient care, the Northwestern University Feinberg School of Medicine (Feinberg), Northwestern Memorial HealthCare, Children's Hospital of Chicago Medical Center, and the Shirley Ryan AbilityLab have adopted integrity policies that require research and clinical faculty (in full-time, part-time, and unpaid/voluntary categories) to report compensated and uncompensated external industry relationships. Patients are encouraged to discuss these disclosures with their physician as well as to inquire as to how these relationships are overseen by Feinberg. To learn more about our Disclosure and Professional Integrity Policy, and the conflict of interest policies of our joint affiliate survey partners, please go to our Office for Regulatory Affairs Policies page.
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